I’d go the other way. Healthy athletes rested for big event would be near impervious. It’d feel like a minor flu. Half of the people don’t even have a fever. There would be gunk in the lungs that show on a CT scan - so I’d imagine it would affect aerobic somewhat.
If athletes were beaten down by hardest part of training with impaired immune systems, that’s different . we’ve seen that story turn into a spreader in Italy.
The people that say this thing is overblown is because it comes and goes and u feel fine. The people that says this sucks is cuz u get quarantined and it reveals something else about patient that makes it worse.
Mathematically, healthy athletes shouldn’t have a problem for the overwhelming majority. Their bodies are ‘younger.’ Younger with corona means won’t die.